#include <stdio.h>
#include <QuickCrypt.h>
/* performs Blowfish encryption/decryption of of a memory buffer portion in Counter mode */
void EncryptDecryptBufferPortion( unsigned char* buff, const unsigned int buffsize, const unsigned char* iv, const unsigned char* key )
{
unsigned char context[ SLC_BLOWFISH_CONTEXTSIZE ];
unsigned int pos = buffsize / 2;
/***** Initialize context ***************************************/
SL_BLOWFISH_Init( context, SLC_ENCRYPT, key, SLC_BLOWFISH_DEFAULTKEYSIZE );
SL_CTR_Init( context, iv );
/***** Encrypt/Decrypt the second half of the memory buffer *****/
SL_CTR_Seek( context, pos );
SL_CTR_Process( context, buff + pos, buff + pos, buffsize - pos ); /* in-place encryption/decryption */
}
void ShowBuffer( const unsigned char* buff, const unsigned int buffsize );
int main()
{
/***** Define key & iv *******************/
char key[SLC_BLOWFISH_DEFAULTKEYSIZE] =
{
's', 'e', 'c', 'r', 'e', 't', 'l', 'y',
'9', '6', '7', '1', '2', '9', '2', '7',
'0', '1', '2', '2', '0', '0', '5', '7',
'*', '-', '*', '-', '*', '-', '*', '-',
'9', '6', '7', '1', '2', '9', '2', '7',
'0', '1', '2', '2', '0', '0', '5', '7',
'*', '-', '*', '-', '*', '-', '*', '-'
};
unsigned char iv[SLC_BLOWFISH_BLOCKSIZE] =
{
0x41, 0x3E, 0xF0, 0xA1, 0xC6, 0x11, 0xE5, 0x50
};
unsigned char buff[] =
{
0xED, 0x39, 0x08, 0x1B, 0xCA, 0xBE, 0x94, 0xCC,
0xA2, 0x04, 0x5F, 0x0C, 0x94, 0xCC, 0xAD, 0xE6,
0x24, 0xCA, 0xFE, 0x33, 0xF9, 0x8B, 0x29, 0x1F,
0x8B, 0xE9, 0x63, 0x1A, 0x96, 0xD9, 0x75, 0xDA
};
unsigned int buffsize = sizeof( buff ) / sizeof( unsigned char );
printf( "Initial memory buffer:\n" );
ShowBuffer( buff, buffsize );
/***** Encrypt memory buffer *************/
EncryptDecryptBufferPortion( buff, buffsize, iv, (const unsigned char*)key );
printf( "Encrypted memory buffer:\n" );
ShowBuffer( buff, buffsize );
/***** Decrypt memory buffer *************/
EncryptDecryptBufferPortion( buff, buffsize, iv, (const unsigned char*)key );
printf( "Decrypted memory buffer:\n" );
ShowBuffer( buff, buffsize );
return 0;
}
void ShowBuffer( const unsigned char* buff, const unsigned int buffsize )
{
unsigned int i = 0;
for( ; i < buffsize; ++i )
{
printf( "%.2x ", (int)buff[ i ] );
if( ( i + 1 ) % SLC_BLOWFISH_BLOCKSIZE == 0 )
printf( "\n" );
}
printf( "\n" );
} |